Laser Light-Scattering Characterization of the Molecular Weight Distribution of Poly(N-isopropylacrylamide)

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (10): 1567.

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Laser Light-Scattering Characterization of the Molecular Weight Distribution of Poly(N-isopropylacrylamide)

ZHOU Shui-Qin, WU Chi

Department of Chemistry, The Chinese University of Hongkong, Shatin, New Territories, Hognkong

Received:1994-04-30 Revised:1994-07-04 Online:1994-10-24 Published:1994-10-24

Abstract

Abstract: Poly(N-isopropylacrylamide)(PNIPAAM)was synthesized by free radical polymerization.Laser light scattering(LLS)including the angular dependence of the absolute integrated scatterred intensity(static LLS)and of the line-width distribution(dynamic LLS)has been successfully used to characterize the molecular weight distribution of PNIPAAM sample.By doing the Laplace transform of precisely measured intensity-intensity time correlation function, we can get a translational diffusion coefficient distribution G(D);After combining the static and dynamic LLS results, i.e.M_w and G(D), we were able to convert G(D)into a molecular weight distribution F_w(M).During this conversion, a calibration of D/cm²·s^-1=2.84×10^-4M^-0.55was established.

Key words: Poly(N-isopropylacrylamide), Laser light scattering, Molecular weight distribution

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ZHOU Shui-Qin, WU Chi. Laser Light-Scattering Characterization of the Molecular Weight Distribution of Poly(N-isopropylacrylamide)[J]. Chem. J. Chinese Universities, 1994, 15(10): 1567.

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Laser Light-Scattering Characterization of the Molecular Weight Distribution of Poly(N-isopropylacrylamide)

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